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The value of t 2-dollar bills and f 5-dollar bills is 87.  If all ordered pairs (t,f) are equally likely, then find the probability that both t and f are prime.

 Dec 14, 2019
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Here are the possibilities:

Two integers are relatively prime if they share no common positive factors (divisors) except 1.

I'll do the first two pairs, then let you take it from there.....

17  1       Yes relatively prime pair

15  6       no  (common factor of 3)

13  11    ?

11   16

9    21

7  26

5  31

3  36

1  41

 Dec 14, 2019
edited by ElectricPavlov  Dec 14, 2019

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